A limited feedback strategy for cooperative multicell MISO systems

Coordinated beamforming is a promising technique to mitigate inter-cell interference arisen from universal frequency reuse in cellular systems. Sharing channel information in neigh- boring cells increases the overall system capacity at the cost of a large feedback requirement. In this paper, an optimized feedback strategy is proposed for multicell beamforming where cooperation is restricted to share only the channel information of active users among coordinated base stations. In order to optimize the feedback link efficiency and improve the overall system performance, we optimize the limited feedback bandwidth based on different average receive power from the serving and neighboring cells. Simulation results demonstrate that the proposed strategy utilizes the limited feedback bandwidth more efficiently, thereby achieving higher sum-rate of the entire multicell system.